John b



(No Model.)

J.- B. BLAIR.

MAGNETO ELECTRIC MACHINE. No. 261.129 Patentd July 13,1882";

UNITED STATES PATENT OFFICE.

JOHN B. BLAIR, OF CHICAGO, ILLINOIS, ASSIGNOR OF THltEE-FOURTHS TO AARON I. M. J EFFERS, IVILLIAM S. OOFFMAN, AND CHARLES IV. LASHER,

ALL OF SAME PLACE.

MAGNETO-ELECTRIC MACHINE.

SPECIFICATION forming part of Letters Patent No. 261,129, dated July 18, 1882.

Application filed May 4, 1882.

To all whom it may concern:

Be it known that I, JOHN B. BLAIR, of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvementsin llIagneto-Electric Machines; and I do hereby declare that the following is afull, clear, and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked to thereon, which form a part of this specification.

This invention relates to improvements in magneto-electric generators or dynamo-electric machines having a rotating armature, the ob- Ig ject of said invention being to make the machine more compact.

The invention consists in the features of construction hereinafter described, and pointed out in the claims.

In the drawings, Figure 1 is a plan view of a machine containing my improvements. Fig. 2 is a fragment ofthe armature detached. Fig. 3 is an end view of the armature, showing in side view two of the adjacent magnet-cores. Fig. 4 is a top view of one of the coiled bars of the magnet, together with a fragment of the frame and of the plate joining the bars. Fig. 5 is an end view of one of the coiled magnet-bars, showing its inclination, and also showing the 0 concavity upon its end whereby it partially embraces the armature. Fig. 6 is a vertical transverse section of one of the magnet-arms.

A is the frame of the machine.

B is the armature, consisting of a cylindric 3 bar, of any desired size. provided with two parallel spiral grooves, 11 l), separated by the correspondiugly-directed flanges, 1) N.

B is the inductioncoil' lyingin said grooves,

and passing over the ends of the bar and run- 40 ning to the commutator, as indicated in Figs.

2 and 3.

B B are caps adapted to be secured to the ends of the bar 13, and provided with shafts b, which project in the direction of the axis of said bar to form journals, upon which it may be mounted, as shown, in bearings A on the frame A.

P is a pulley for rotating the armature, and

magnet bars or cores may, if concaved, be lll It is a suitable pole-changer or commutator.

(No model.)

A A are vertical bars of metal secured to the frame A in position parallel with and opposite the armature, and D and D are opposite series of flat metal arms of about the same thickness as the faces of the flanges b b of the armature, and are connected directly with the bars A so as to present their free ends in proximity with the armature. Said arms D and D are preferably concaved at their free ends to nearly embrace the armature, as shown in Fig. 3, and they are set inclined to correspond with the pitch of the flange-faces of the armature. Said arms D D are also set at the same distance apart from center to center as the said flange-faces, and are of an even num her in each series. Further, they are arranged 6 5 to oppose the same flanges when the armature is in the position at which it stands in Fig. 1.

If desired, the concave ends of the cores D D may be broadened to nearly proximate later ally.

The arms DD are coiled and connected with each other and with the commutator by the insulated wire 61 from which wire the working circuit is shown broken out, the direction or-conncction of the coils about said arms being such as to give opposite polarity to alternate arms in either seriesor on the same side of the armature, and such also as to give simi= lar polarity to arms facing the same flange of the armature throughout the machine.

The necessary or usual binding posts, brushes, and insulators are present in the machine, and need not be severally described.

It is manifest that by the spiral construction of the armature and by the serial arran gementof the magnets D D, as described and shown, the armature of a given capacity is very greatly shortened, and the machine made more compact in form, more steady in operation, and more durable.

Two machines of the construction shown may be obviously conveniently connected end to end, so that one shall operate to maintainthe field force for both, while the other operates the working circuit.

The machine will of course be operative with a single series of magnets, D or D, and the clined to the pitch of the spiral armatureflanges at their ends only. A

I claim as my invention- 1. In an electric generator, a rotating cylindric armature, 13, provided with parallel spiral grooves b b and intermediate flanges, b I), combined with an induction-coil, B, deposited in said grooves, and with suitable magnets having their poles separated by a' distance equal to the distance between the flanges of the armature, and arranged to proximate the armature, substantially as described.

2. The combination, with the spirally flanged and coiled armature B, of the two opposite series of coiled and connected arms D D,-altern atin g in polarity in each series, and arranged to proximate the armature, so that when the flanges of said armature'are opposed to the arms of one series they are also severally opposed to arms having the same polarity in the other series, substantially as described.

3. In combination with the spirally-flanged armature B, the magnets D or D, having their free ends concaved to partially embrace the armature, and setinclined, substantially as and for the purposes set forth.

In testimony that I claim the foregoing as my inventionl afflx my signature in presence of two witnesses.

7 JOHN B. BLAIR.

Witnesses:

M. E. DAYTON, W. O. ADAMS. 

